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Last week, Net Impact San Francisco hosted its annual Sustainable Trivia Night at Kilowatt, a favorite bar of ours located in the heart of the Mission District. We had a great turnout and lots of fun competition between the teams!

Here are five questions and answers from the evening to test your own "green" brains:

Q: What was the first city in the U.S. to ban the sale of plastic water bottles?A: San Francisco"To curb the issue of plastic pollution, the city of San Francisco has just done something monumental: it has become the first in America to ban the sale of plastic water bottles. Over the next four years, the ban will phase out the sales of plastic water bottles that hold 21 ounces or less in public spaces." True Activist

Q: What percent of U.S. landfills are made up of food scraps and yard clippings?A: 25%"In the U.S., a quarter of solid waste in landfills is made up of organic matter. Composting organic kitchen and yard trimmings for use as a natural fertilizer can help reduce this volume while providing a safe, chemical-free alternative to commercial fertilizers in your yard or vegetable garden." National Geographic

Q: There are over 80,000 dams along rivers in the U.S. How many are equipped to produce power? A: 3%"Only 3 percent of the nation’s 80,000 dams currently generate electricity, and as we move to a clean energy economy, it is vital that we tap these unused resources." National Hydropower Association

Q: Recycling one aluminum can will save enough energy to power a television for ___ hours. A: 2-4 hours"Interestingly enough it takes much less energy to recycle any object including aluminum cans than to create any object from raw materials, meaning by recycling we can save a lot of resources. It has been calculated that by recycling only one aluminum can the process can save enough energy to power a TV for three whole hours..." DoRecycling